I'm using NAV 7.02 Corporate. For some reason, I think NAV 2000 is version 6.0 ... but NAV 2001 *may* not be 7.0 ... as I am using 7.02 FINAL. Weird.
For those having trouble with NAV and Win2K, make sure you are not trying to install the Win9x version. THere is an NT-specific version that runs as an NT service.
-SUO